Briefly describe two different ways in which intragenic...

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Key Concepts

Intragenic Suppression

This concept refers to the phenomenon where a secondary mutation within the same gene mitigates or reverses the negative effects of an original mutation. By occurring in cis with the primary mutation, these suppressors can restore some or all of the gene’s normal function, despite the presence of the initial defect.

Frameshift Correction

One mechanism of intragenic suppression involves correcting a frameshift mutation. In cases where the original mutation causes a shift in the reading frame (due to an insertion or deletion), a second mutation that adds or removes nucleotides near the original defect can restore the correct reading frame, allowing for proper protein synthesis.

Compensatory Mutation

Another mechanism involves compensatory amino acid changes. Here, a secondary mutation results in a change in another part of the protein that counterbalances the structural or functional disruption caused by the original mutation. This restoration of protein conformation or activity can effectively suppress the deleterious consequences of the first mutation.

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